/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef UV_UNIX_H
#define UV_UNIX_H

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <termios.h>
#include <pwd.h>

#include <semaphore.h>
#include <pthread.h>
#include <signal.h>

#include "uv-threadpool.h"

#if defined(__linux__)
#include "uv-linux.h"
#elif defined(_AIX)
#include "uv-aix.h"
#elif defined(__sun)
#include "uv-sunos.h"
#elif defined(__APPLE__)
#include "uv-darwin.h"
#elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
#include "uv-bsd.h"
#endif

#ifndef PTHREAD_BARRIER_SERIAL_THREAD
#include "pthread-barrier.h"
#endif

#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif

#ifndef NI_MAXSERV
#define NI_MAXSERV 32
#endif

#ifndef UV_IO_PRIVATE_PLATFORM_FIELDS
#define UV_IO_PRIVATE_PLATFORM_FIELDS /* empty */
#endif

struct uv__io_s;
struct uv__async;
struct uv_loop_s;

typedef void (*uv__io_cb)(struct uv_loop_s* loop,
    struct uv__io_s* w,
    unsigned int events);
typedef struct uv__io_s uv__io_t;

struct uv__io_s {
    uv__io_cb cb;
    void* pending_queue[2];
    void* watcher_queue[2];
    unsigned int pevents; /* Pending event mask i.e. mask at next tick. */
    unsigned int events; /* Current event mask. */
    int fd;
    UV_IO_PRIVATE_PLATFORM_FIELDS
};

typedef void (*uv__async_cb)(struct uv_loop_s* loop,
    struct uv__async* w,
    unsigned int nevents);

struct uv__async {
    uv__async_cb cb;
    uv__io_t io_watcher;
    int wfd;
};

#ifndef UV_PLATFORM_SEM_T
#define UV_PLATFORM_SEM_T sem_t
#endif

#ifndef UV_PLATFORM_LOOP_FIELDS
#define UV_PLATFORM_LOOP_FIELDS /* empty */
#endif

#ifndef UV_PLATFORM_FS_EVENT_FIELDS
#define UV_PLATFORM_FS_EVENT_FIELDS /* empty */
#endif

#ifndef UV_STREAM_PRIVATE_PLATFORM_FIELDS
#define UV_STREAM_PRIVATE_PLATFORM_FIELDS /* empty */
#endif

/* Note: May be cast to struct iovec. See writev(2). */
typedef struct uv_buf_t {
    char* base;
    size_t len;
} uv_buf_t;

typedef int uv_file;
typedef int uv_os_sock_t;
typedef int uv_os_fd_t;

#define UV_ONCE_INIT PTHREAD_ONCE_INIT

typedef pthread_once_t uv_once_t;
typedef pthread_t uv_thread_t;
typedef pthread_mutex_t uv_mutex_t;
typedef pthread_rwlock_t uv_rwlock_t;
typedef UV_PLATFORM_SEM_T uv_sem_t;
typedef pthread_cond_t uv_cond_t;
typedef pthread_key_t uv_key_t;
typedef pthread_barrier_t uv_barrier_t;

/* Platform-specific definitions for uv_spawn support. */
typedef gid_t uv_gid_t;
typedef uid_t uv_uid_t;

typedef struct dirent uv__dirent_t;

#if defined(DT_UNKNOWN)
#define HAVE_DIRENT_TYPES
#if defined(DT_REG)
#define UV__DT_FILE DT_REG
#else
#define UV__DT_FILE -1
#endif
#if defined(DT_DIR)
#define UV__DT_DIR DT_DIR
#else
#define UV__DT_DIR -2
#endif
#if defined(DT_LNK)
#define UV__DT_LINK DT_LNK
#else
#define UV__DT_LINK -3
#endif
#if defined(DT_FIFO)
#define UV__DT_FIFO DT_FIFO
#else
#define UV__DT_FIFO -4
#endif
#if defined(DT_SOCK)
#define UV__DT_SOCKET DT_SOCK
#else
#define UV__DT_SOCKET -5
#endif
#if defined(DT_CHR)
#define UV__DT_CHAR DT_CHR
#else
#define UV__DT_CHAR -6
#endif
#if defined(DT_BLK)
#define UV__DT_BLOCK DT_BLK
#else
#define UV__DT_BLOCK -7
#endif
#endif

/* Platform-specific definitions for uv_dlopen support. */
#define UV_DYNAMIC /* empty */

typedef struct {
    void* handle;
    char* errmsg;
} uv_lib_t;

#define UV_LOOP_PRIVATE_FIELDS      \
    unsigned long flags;            \
    int backend_fd;                 \
    void* pending_queue[2];         \
    void* watcher_queue[2];         \
    uv__io_t** watchers;            \
    unsigned int nwatchers;         \
    unsigned int nfds;              \
    void* wq[2];                    \
    uv_mutex_t wq_mutex;            \
    uv_async_t wq_async;            \
    uv_rwlock_t cloexec_lock;       \
    uv_handle_t* closing_handles;   \
    void* process_handles[2];       \
    void* prepare_handles[2];       \
    void* check_handles[2];         \
    void* idle_handles[2];          \
    void* async_handles[2];         \
    struct uv__async async_watcher; \
    struct {                        \
        void* min;                  \
        unsigned int nelts;         \
    } timer_heap;                   \
    uint64_t timer_counter;         \
    uint64_t time;                  \
    int signal_pipefd[2];           \
    uv__io_t signal_io_watcher;     \
    uv_signal_t child_watcher;      \
    int emfile_fd;                  \
    UV_PLATFORM_LOOP_FIELDS

#define UV_REQ_TYPE_PRIVATE /* empty */

#define UV_REQ_PRIVATE_FIELDS /* empty */

#define UV_PRIVATE_REQ_TYPES /* empty */

#define UV_WRITE_PRIVATE_FIELDS \
    void* queue[2];             \
    unsigned int write_index;   \
    uv_buf_t* bufs;             \
    unsigned int nbufs;         \
    int error;                  \
    uv_buf_t bufsml[4];

#define UV_CONNECT_PRIVATE_FIELDS \
    void* queue[2];

#define UV_SHUTDOWN_PRIVATE_FIELDS /* empty */

#define UV_UDP_SEND_PRIVATE_FIELDS \
    void* queue[2];                \
    struct sockaddr_storage addr;  \
    unsigned int nbufs;            \
    uv_buf_t* bufs;                \
    ssize_t status;                \
    uv_udp_send_cb send_cb;        \
    uv_buf_t bufsml[4];

#define UV_HANDLE_PRIVATE_FIELDS \
    uv_handle_t* next_closing;   \
    unsigned int flags;

#define UV_STREAM_PRIVATE_FIELDS    \
    uv_connect_t* connect_req;      \
    uv_shutdown_t* shutdown_req;    \
    uv__io_t io_watcher;            \
    void* write_queue[2];           \
    void* write_completed_queue[2]; \
    uv_connection_cb connection_cb; \
    int delayed_error;              \
    int accepted_fd;                \
    void* queued_fds;               \
    UV_STREAM_PRIVATE_PLATFORM_FIELDS

#define UV_TCP_PRIVATE_FIELDS /* empty */

#define UV_UDP_PRIVATE_FIELDS \
    uv_alloc_cb alloc_cb;     \
    uv_udp_recv_cb recv_cb;   \
    uv__io_t io_watcher;      \
    void* write_queue[2];     \
    void* write_completed_queue[2];

#define UV_PIPE_PRIVATE_FIELDS \
    const char* pipe_fname; /* strdup'ed */

#define UV_POLL_PRIVATE_FIELDS \
    uv__io_t io_watcher;

#define UV_PREPARE_PRIVATE_FIELDS \
    uv_prepare_cb prepare_cb;     \
    void* queue[2];

#define UV_CHECK_PRIVATE_FIELDS \
    uv_check_cb check_cb;       \
    void* queue[2];

#define UV_IDLE_PRIVATE_FIELDS \
    uv_idle_cb idle_cb;        \
    void* queue[2];

#define UV_ASYNC_PRIVATE_FIELDS \
    uv_async_cb async_cb;       \
    void* queue[2];             \
    int pending;

#define UV_TIMER_PRIVATE_FIELDS \
    uv_timer_cb timer_cb;       \
    void* heap_node[3];         \
    uint64_t timeout;           \
    uint64_t repeat;            \
    uint64_t start_id;

#define UV_GETADDRINFO_PRIVATE_FIELDS \
    struct uv__work work_req;         \
    uv_getaddrinfo_cb cb;             \
    struct addrinfo* hints;           \
    char* hostname;                   \
    char* service;                    \
    struct addrinfo* addrinfo;        \
    int retcode;

#define UV_GETNAMEINFO_PRIVATE_FIELDS \
    struct uv__work work_req;         \
    uv_getnameinfo_cb getnameinfo_cb; \
    struct sockaddr_storage storage;  \
    int flags;                        \
    char host[NI_MAXHOST];            \
    char service[NI_MAXSERV];         \
    int retcode;

#define UV_PROCESS_PRIVATE_FIELDS \
    void* queue[2];               \
    int status;

#define UV_FS_PRIVATE_FIELDS  \
    const char* new_path;     \
    uv_file file;             \
    int flags;                \
    mode_t mode;              \
    unsigned int nbufs;       \
    uv_buf_t* bufs;           \
    off_t off;                \
    uv_uid_t uid;             \
    uv_gid_t gid;             \
    double atime;             \
    double mtime;             \
    struct uv__work work_req; \
    uv_buf_t bufsml[4];

#define UV_WORK_PRIVATE_FIELDS \
    struct uv__work work_req;

#define UV_TTY_PRIVATE_FIELDS    \
    struct termios orig_termios; \
    int mode;

#define UV_SIGNAL_PRIVATE_FIELDS                                       \
    /* RB_ENTRY(uv_signal_s) tree_entry; */                            \
    struct {                                                           \
        struct uv_signal_s* rbe_left;                                  \
        struct uv_signal_s* rbe_right;                                 \
        struct uv_signal_s* rbe_parent;                                \
        int rbe_color;                                                 \
    } tree_entry;                                                      \
    /* Use two counters here so we don have to fiddle with atomics. */ \
    unsigned int caught_signals;                                       \
    unsigned int dispatched_signals;

#define UV_FS_EVENT_PRIVATE_FIELDS \
    uv_fs_event_cb cb;             \
    UV_PLATFORM_FS_EVENT_FIELDS

#endif /* UV_UNIX_H */
